[Barnsnake]

Have the alignment settings been checked recently?

You may want to try reducing the toe to near zero (maybe 1/32 toe-in) and see if it addresses your problem. With a light car and big tires, when the tires are aimed at different points it can be darty when one or the other tire "wins the directional argument".
4-4.5 degrees caster is a good starting point.

On a car as light as a Cobra and with the hardness of the T/As, your tires probably wouldn't show wear if your toe was at 1".